Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - system monitor Dual voltage detector SOIC 18

FEATURES DESCRIPTION

BLOCK DIAGRAM

Note: Pin numbers refer to J, N and DW packages.

UC1903

UC2903

UC3903

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........................................................................................................................................ SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008

Quad Supply and Line Monitor

• Inputs for Monitoring up to Four Separate

The UC1903 family of quad supply and line monitor

Supply Voltage Levels

integrated circuits will respond to under- and

over-voltage conditions on up to four continuously

• Internal Inverter for Sensing a Negative Supply

monitored voltage levels. An internal op-amp inverter

Voltage

allows at least one of these levels to be negative. A

• Line/Switch Sense Input for Early Power

separate line/switcher sense input is available to

Source Failure Warning

provide early warning of line or other power source

• Programmable Under- and Over-Voltage Fault

failures.

Thresholds with Proportional Hysteresis

The fault window adjustment circuit on these devices

• A Precision 2.5-V Reference

provides easy programming of under- and

over-voltage thresholds. The thresholds, centered

• General Purpose Op-Amp for Auxiliary Use

around a precision 2.5-V reference, have an input

• Three High Current, >3 0mA, Open-Collector

hysteresis that scales with the window width for

Outputs Indicate Over-Voltage, Under-Voltage

precise, glitch-free operation. A reference output pin

and Power OK Conditions

allows the sense input fault windows to be scaled

• 8-V to 40-V Supply Operation with 7-mA

independently using simple resistive dividers.

Stand-By Current

The three open collector outputs on these devices

sink in excess of 30 mA of load current when active.

The under- and over-voltage outputs respond after

separate, user defined, delays to respective fault

conditions. The third output is active during any fault

condition including under- and over-voltage,

line/switcher faults, and input supply under-voltage.

The off state of this output indicates a "power OK"

situation.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (16 pages)

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UC1903 UC2903 UC3903 www.ti.com ........................................................................................................................................
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UC1903 UC2903 UC3903 SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 ........................................................................................................................................ www.ti.com DESCRIPTION (CONT.) An additional, uncommitted, general purpose op-amp is also included. This op-amp, capable of sourcing 20 mA of output current, can be used for a number of auxiliary functions including the sensing and amplification of a feedback error signal when the 2.
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UC1903 UC2903 UC3903 www.ti.com ........................................................................................................................................ SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for the UC1903; –40°C to +85°C for the UC2903; and 0°C to +70°C for the UC3903; +VIN = 15V; Sense Inputs (Pins 6–9 and Pin 15) = 2.5V; VPIN 4 = 1.0V, TA = TJ.
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UC1903 UC2903 UC3903 SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 ........................................................................................................................................ www.ti.com ELECTRICAL CHARACTERISTICS (continued) Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for the UC1903; –40°C to +85°C for the UC2903; and 0°C to +70°C for the UC3903; +VIN = 15V; Sense Inputs (Pins 6–9 and Pin 15) = 2.5V; VPIN 4 = 1.0V, TA = TJ.
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UC1903 UC2903 UC3903 www.ti.com ........................................................................................................................................ SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 Block Diagram UC1903 +VIN REFERENCE CIRCUIT IOA IOB Q4 1.25 V Q2 Q1 OV THRESHOLD Q3 2.5 V OUTPUT 15 W R1 2.5 kW R2 2.5 kW R3 RA VADJ RS A. TO OV HYSTERESIS CONTROL 1.84 kW R5 VADJ IO = R4 0.16 kW R7 0.16 kW R8 1.
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UC1903 UC2903 UC3903 SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 ........................................................................................................................................ www.ti.com OPERATION AND APPLICATION INFORMATION Setting a Fault Window The fault thresholds on the UC1903 are generated by creating positive and negative offsets, equal in magnitude, that are referenced to the chip’s 2.5-V reference. The resulting fault window is centered around 2.
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UC1903 UC2903 UC3903 www.ti.com ........................................................................................................................................ SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 Fault Windows Scaled Independently In many applications, it may be desirable to monitor various supply voltages, or voltage levels, with varying fault windows. Using the reference output and external resistive dividers this is easily accomplished with the UC1903.
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UC1903 UC2903 UC3903 SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 ........................................................................................................................................ www.ti.com Figure 4 demonstrates one of many auxiliary functions that the uncommitted op-amp on the UC1903 can be used for. Alternatively, this op-amp can be used to buffer high impedance points, perform logic functions, or for sensing and amplification. For example, the G.P.
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UC1903 UC2903 UC3903 www.ti.com ........................................................................................................................................ SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 Using The Line/Switcher Sense Output The line switcher sense input to the UC1903 can be used for early detection of line, switcher, or other power source, failures. Internally referenced to 2.
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UC1903 UC2903 UC3903 SLUS233A – OCTOBER 1999 – REVISED SEPTEMBER 2008 ........................................................................................................................................ www.ti.com OV and UV Comparators Maintain Accurate Thresholds The structure of the OV and UV comparators, shown in Figure 8 results in accurate fault thresholds even in the case where multiple sense inputs cross a fault threshold simultaneously. Unused sense inputs can be tied either to the 2.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 25-Sep-2013 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device UC3903DWTR Package Package Pins Type Drawing SOIC DW 18 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 24.4 Pack Materials-Page 1 10.9 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 12.0 2.7 12.0 24.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UC3903DWTR SOIC DW 18 2000 367.0 367.0 45.
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